/**
  ******************************************************************************
  * @file    usbd_cdc.c
  * @author  MCD Application Team
  * @version V2.2.0
  * @date    13-June-2014
  * @brief   This file provides the high layer firmware functions to manage the 
  *          following functionalities of the USB CDC Class:
  *           - Initialization and Configuration of high and low layer
  *           - Enumeration as CDC Device (and enumeration for each implemented memory interface)
  *           - OUT/IN data transfer
  *           - Command IN transfer (class requests management)
  *           - Error management
  *           
  *  @verbatim
  *      
  *          ===================================================================      
  *                                CDC Class Driver Description
  *          =================================================================== 
  *           This driver manages the "Universal Serial Bus Class Definitions for Communications Devices
  *           Revision 1.2 November 16, 2007" and the sub-protocol specification of "Universal Serial Bus 
  *           Communications Class Subclass Specification for PSTN Devices Revision 1.2 February 9, 2007"
  *           This driver implements the following aspects of the specification:
  *             - Device descriptor management
  *             - Configuration descriptor management
  *             - Enumeration as CDC device with 2 data endpoints (IN and OUT) and 1 command endpoint (IN)
  *             - Requests management (as described in section 6.2 in specification)
  *             - Abstract Control Model compliant
  *             - Union Functional collection (using 1 IN endpoint for control)
  *             - Data interface class
  * 
  *           These aspects may be enriched or modified for a specific user application.
  *          
  *            This driver doesn't implement the following aspects of the specification 
  *            (but it is possible to manage these features with some modifications on this driver):
  *             - Any class-specific aspect relative to communication classes should be managed by user application.
  *             - All communication classes other than PSTN are not managed
  *      
  *  @endverbatim
  *                                  
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "USBD_CDC.h"
#include "usbd_desc.h"
#include "usbd_ctlreq.h"


/** @addtogroup STM32_USB_DEVICE_LIBRARY
  * @{
  */


/** @defgroup USBD_CDC 
  * @brief usbd core module
  * @{
  */ 

/** @defgroup USBD_CDC_Private_TypesDefinitions
  * @{
  */ 
/**
  * @}
  */ 


/** @defgroup USBD_CDC_Private_Defines
  * @{
  */ 
/**
  * @}
  */ 


/** @defgroup USBD_CDC_Private_Macros
  * @{
  */ 

/**
  * @}
  */ 


/** @defgroup USBD_CDC_Private_FunctionPrototypes
  * @{
  */


static uint8_t  USBD_CDC_Init (USBD_HandleTypeDef *pdev, uint8_t cfgidx);
static uint8_t  USBD_CDC_DeInit (USBD_HandleTypeDef *pdev, uint8_t cfgidx);
static uint8_t  USBD_CDC_Setup (USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);
static uint8_t  USBD_CDC_DataIn (USBD_HandleTypeDef *pdev, uint8_t epnum);
static uint8_t  USBD_CDC_DataOut (USBD_HandleTypeDef *pdev, uint8_t epnum);
static uint8_t  USBD_CDC_EP0_RxReady (USBD_HandleTypeDef *pdev);
static uint8_t  *USBD_CDC_GetFSCfgDesc (uint16_t *length);
static uint8_t  *USBD_CDC_GetHSCfgDesc (uint16_t *length);
static uint8_t  *USBD_CDC_GetOtherSpeedCfgDesc (uint16_t *length);
static uint8_t  *USBD_CDC_GetOtherSpeedCfgDesc (uint16_t *length);
uint8_t  *USBD_CDC_GetDeviceQualifierDescriptor (uint16_t *length);

/* USB Standard Device Descriptor */
__ALIGN_BEGIN static uint8_t USBD_CDC_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_DESC] __ALIGN_END =
{
	USB_LEN_DEV_QUALIFIER_DESC,
	USB_DESC_TYPE_DEVICE_QUALIFIER,
	0x00,
	0x02,
	0x00,
	0x00,
	0x00,
	0x40,
	0x01,
	0x00,
};

/**
  * @}
  */ 

/** @defgroup USBD_CDC_Private_Variables
  * @{
  */ 


/* CDC interface class callbacks structure */
USBD_ClassTypeDef USBD_CDC = 
{
	USBD_CDC_Init,
	USBD_CDC_DeInit,
	USBD_CDC_Setup,
	NULL,					/* EP0_TxSent, */
	USBD_CDC_EP0_RxReady,
	USBD_CDC_DataIn,
	USBD_CDC_DataOut,
	NULL,
	NULL,
	NULL,     
	USBD_CDC_GetHSCfgDesc,
	USBD_CDC_GetFSCfgDesc,
	USBD_CDC_GetOtherSpeedCfgDesc,
	USBD_CDC_GetDeviceQualifierDescriptor,
};

/* USB CDC device Configuration Descriptor */
__ALIGN_BEGIN uint8_t USBD_CDC_CfgHSDesc[USB_CDC_CONFIG_DESC_SIZ] __ALIGN_END =
{
	/*Configuration Descriptor*/
	0x09,   /* bLength: Configuration Descriptor size */
	USB_DESC_TYPE_CONFIGURATION,      /* bDescriptorType: Configuration */
	USB_CDC_CONFIG_DESC_SIZ,                /* wTotalLength:no of returned bytes */
	0x00,
	0x02,	/* bNumInterfaces: 2 interface */
	0x01,	/* bConfigurationValue: Configuration value */
	0x00,	/* iConfiguration: Index of string descriptor describing the configuration */
	0xC0,	/* bmAttributes: self powered */
	100,	/* MaxPower 0 mA */
  
	/*---------------------------------------------------------------------------*/
  
	/*Interface Descriptor */
	0x09,   /* bLength: Interface Descriptor size */
	USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: Interface */
	/* Interface descriptor type */
	0x00,   /* bInterfaceNumber: Number of Interface */
	0x00,   /* bAlternateSetting: Alternate setting */
	0x01,   /* bNumEndpoints: One endpoints used */
	0x02,   /* bInterfaceClass: Communication Interface Class */
	0x02,   /* bInterfaceSubClass: Abstract Control Model */
	0x01,   /* bInterfaceProtocol: Common AT commands */
	0x00,   /* iInterface: */
  
	/*Header Functional Descriptor*/
	0x05,   /* bLength: Endpoint Descriptor size */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x00,   /* bDescriptorSubtype: Header Func Desc */
	0x10,   /* bcdCDC: spec release number */
	0x01,
  
	/*Call Management Functional Descriptor*/
	0x05,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x01,   /* bDescriptorSubtype: Call Management Func Desc */
	0x00,   /* bmCapabilities: D0+D1 */
	0x01,   /* bDataInterface: 1 */
  
	/*ACM Functional Descriptor*/
	0x04,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x02,   /* bDescriptorSubtype: Abstract Control Management desc */
	0x02,   /* bmCapabilities */
  
	/*Union Functional Descriptor*/
	0x05,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x06,   /* bDescriptorSubtype: Union func desc */
	0x00,   /* bMasterInterface: Communication class interface */
	0x01,   /* bSlaveInterface0: Data Class Interface */

	/*Endpoint 2 Descriptor*/
	0x07,                           /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,   /* bDescriptorType: Endpoint */
	CDC_CMD_EP,                     /* bEndpointAddress */
	0x03,                           /* bmAttributes: Interrupt */
	LOBYTE(CDC_CMD_PACKET_SIZE),     /* wMaxPacketSize: */
	HIBYTE(CDC_CMD_PACKET_SIZE),
	0x10,                           /* bInterval: */ 
	/*---------------------------------------------------------------------------*/

	/*Data class interface descriptor*/
	0x09,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: */
	0x01,   /* bInterfaceNumber: Number of Interface */
	0x00,   /* bAlternateSetting: Alternate setting */
	0x02,   /* bNumEndpoints: Two endpoints used */
	0x0A,   /* bInterfaceClass: CDC */
	0x00,   /* bInterfaceSubClass: */
	0x00,   /* bInterfaceProtocol: */
	0x00,   /* iInterface: */

	/*Endpoint OUT Descriptor*/
	0x07,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */
	CDC_OUT_EP,                        /* bEndpointAddress */
	0x02,                              /* bmAttributes: Bulk */
	LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */
	HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
	0x00,                              /* bInterval: ignore for Bulk transfer */

	/*Endpoint IN Descriptor*/
	0x07,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */
	CDC_IN_EP,                         /* bEndpointAddress */
	0x02,                              /* bmAttributes: Bulk */
	LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */
	HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
	0x00                               /* bInterval: ignore for Bulk transfer */
};


/* USB CDC device Configuration Descriptor */
__ALIGN_BEGIN uint8_t USBD_CDC_CfgFSDesc[USB_CDC_CONFIG_DESC_SIZ] __ALIGN_END =
{
	/*Configuration Descriptor*/
	0x09,   /* bLength: Configuration Descriptor size */
	USB_DESC_TYPE_CONFIGURATION,      /* bDescriptorType: Configuration */
	USB_CDC_CONFIG_DESC_SIZ,                /* wTotalLength:no of returned bytes */
	0x00,
	0x02,   /* bNumInterfaces: 2 interface */
	0x01,   /* bConfigurationValue: Configuration value */
	0x00,   /* iConfiguration: Index of string descriptor describing the configuration */
	0xC0,   /* bmAttributes: self powered */
	0x32,   /* MaxPower 0 mA */

	/*---------------------------------------------------------------------------*/

	/*Interface Descriptor */
	0x09,   /* bLength: Interface Descriptor size */
	USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: Interface */
	/* Interface descriptor type */
	0x00,   /* bInterfaceNumber: Number of Interface */
	0x00,   /* bAlternateSetting: Alternate setting */
	0x01,   /* bNumEndpoints: One endpoints used */
	0x02,   /* bInterfaceClass: Communication Interface Class */
	0x02,   /* bInterfaceSubClass: Abstract Control Model */
	0x01,   /* bInterfaceProtocol: Common AT commands */
	0x00,   /* iInterface: */

	/*Header Functional Descriptor*/
	0x05,   /* bLength: Endpoint Descriptor size */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x00,   /* bDescriptorSubtype: Header Func Desc */
	0x10,   /* bcdCDC: spec release number */
	0x01,

	/*Call Management Functional Descriptor*/
	0x05,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x01,   /* bDescriptorSubtype: Call Management Func Desc */
	0x00,   /* bmCapabilities: D0+D1 */
	0x01,   /* bDataInterface: 1 */

	/*ACM Functional Descriptor*/
	0x04,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x02,   /* bDescriptorSubtype: Abstract Control Management desc */
	0x02,   /* bmCapabilities */

	/*Union Functional Descriptor*/
	0x05,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x06,   /* bDescriptorSubtype: Union func desc */
	0x00,   /* bMasterInterface: Communication class interface */
	0x01,   /* bSlaveInterface0: Data Class Interface */

	/*Endpoint 2 Descriptor*/
	0x07,                           /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,   /* bDescriptorType: Endpoint */
	CDC_CMD_EP,                     /* bEndpointAddress */
	0x03,                           /* bmAttributes: Interrupt */
	LOBYTE(CDC_CMD_PACKET_SIZE),     /* wMaxPacketSize: */
	HIBYTE(CDC_CMD_PACKET_SIZE),
	0x10,                           /* bInterval: */ 
	/*---------------------------------------------------------------------------*/

	/*Data class interface descriptor*/
	0x09,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: */
	0x01,   /* bInterfaceNumber: Number of Interface */
	0x00,   /* bAlternateSetting: Alternate setting */
	0x02,   /* bNumEndpoints: Two endpoints used */
	0x0A,   /* bInterfaceClass: CDC */
	0x00,   /* bInterfaceSubClass: */
	0x00,   /* bInterfaceProtocol: */
	0x00,   /* iInterface: */

	/*Endpoint OUT Descriptor*/
	0x07,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */
	CDC_OUT_EP,                        /* bEndpointAddress */
	0x02,                              /* bmAttributes: Bulk */
	LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */
	HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
	0x00,                              /* bInterval: ignore for Bulk transfer */

	/*Endpoint IN Descriptor*/
	0x07,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */
	CDC_IN_EP,                         /* bEndpointAddress */
	0x02,                              /* bmAttributes: Bulk */
	LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */
	HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
	0x00                               /* bInterval: ignore for Bulk transfer */
};

__ALIGN_BEGIN uint8_t USBD_CDC_OtherSpeedCfgDesc[USB_CDC_CONFIG_DESC_SIZ] __ALIGN_END =
{ 
	0x09,   /* bLength: Configuation Descriptor size */
	USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION,   
	USB_CDC_CONFIG_DESC_SIZ,
	0x00,
	0x02,   /* bNumInterfaces: 2 interfaces */
	0x01,   /* bConfigurationValue: */
	0x04,   /* iConfiguration: */
	0xC0,   /* bmAttributes: */
	0x32,   /* MaxPower 100 mA */  

	/*Interface Descriptor */
	0x09,   /* bLength: Interface Descriptor size */
	USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: Interface */
	/* Interface descriptor type */
	0x00,   /* bInterfaceNumber: Number of Interface */
	0x00,   /* bAlternateSetting: Alternate setting */
	0x01,   /* bNumEndpoints: One endpoints used */
	0x02,   /* bInterfaceClass: Communication Interface Class */
	0x02,   /* bInterfaceSubClass: Abstract Control Model */
	0x01,   /* bInterfaceProtocol: Common AT commands */
	0x00,   /* iInterface: */

	/*Header Functional Descriptor*/
	0x05,   /* bLength: Endpoint Descriptor size */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x00,   /* bDescriptorSubtype: Header Func Desc */
	0x10,   /* bcdCDC: spec release number */
	0x01,

	/*Call Management Functional Descriptor*/
	0x05,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x01,   /* bDescriptorSubtype: Call Management Func Desc */
	0x00,   /* bmCapabilities: D0+D1 */
	0x01,   /* bDataInterface: 1 */

	/*ACM Functional Descriptor*/
	0x04,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x02,   /* bDescriptorSubtype: Abstract Control Management desc */
	0x02,   /* bmCapabilities */

	/*Union Functional Descriptor*/
	0x05,   /* bFunctionLength */
	0x24,   /* bDescriptorType: CS_INTERFACE */
	0x06,   /* bDescriptorSubtype: Union func desc */
	0x00,   /* bMasterInterface: Communication class interface */
	0x01,   /* bSlaveInterface0: Data Class Interface */

	/*Endpoint 2 Descriptor*/
	0x07,                           /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT      ,   /* bDescriptorType: Endpoint */
	CDC_CMD_EP,                     /* bEndpointAddress */
	0x03,                           /* bmAttributes: Interrupt */
	LOBYTE(CDC_CMD_PACKET_SIZE),     /* wMaxPacketSize: */
	HIBYTE(CDC_CMD_PACKET_SIZE),
	0xFF,                           /* bInterval: */

	/*---------------------------------------------------------------------------*/

	/*Data class interface descriptor*/
	0x09,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: */
	0x01,   /* bInterfaceNumber: Number of Interface */
	0x00,   /* bAlternateSetting: Alternate setting */
	0x02,   /* bNumEndpoints: Two endpoints used */
	0x0A,   /* bInterfaceClass: CDC */
	0x00,   /* bInterfaceSubClass: */
	0x00,   /* bInterfaceProtocol: */
	0x00,   /* iInterface: */

	/*Endpoint OUT Descriptor*/
	0x07,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */
	CDC_OUT_EP,                        /* bEndpointAddress */
	0x02,                              /* bmAttributes: Bulk */
	0x40,                              /* wMaxPacketSize: */
	0x00,
	0x00,                              /* bInterval: ignore for Bulk transfer */

	/*Endpoint IN Descriptor*/
	0x07,   /* bLength: Endpoint Descriptor size */
	USB_DESC_TYPE_ENDPOINT,     /* bDescriptorType: Endpoint */
	CDC_IN_EP,                        /* bEndpointAddress */
	0x02,                             /* bmAttributes: Bulk */
	0x40,                             /* wMaxPacketSize: */
	0x00,
	0x00                              /* bInterval */
};

/**
  * @}
  */ 

/** @defgroup USBD_CDC_Private_Functions
  * @{
  */ 

/**
  * @brief  USBD_CDC_Init
  *         Initilaize the CDC interface
  * @param  pdev: device instance
  * @param  cfgidx: Configuration index
  * @retval status
  */
static uint8_t  USBD_CDC_Init (USBD_HandleTypeDef *pdev, uint8_t cfgidx)
{
	uint8_t ret = 0;
	USBD_CDC_HandleTypeDef   *hcdc;

	if (pdev->dev_speed == USBD_SPEED_HIGH  ) 
	{  
		/* Open EP IN */
		USBD_LL_OpenEP(	pdev,
						CDC_IN_EP,
						USBD_EP_TYPE_BULK,
						CDC_DATA_HS_IN_PACKET_SIZE);

		/* Open EP OUT */
		USBD_LL_OpenEP(	pdev,
						CDC_OUT_EP,
						USBD_EP_TYPE_BULK,
						CDC_DATA_HS_OUT_PACKET_SIZE);
	}
	else
	{
		/* Open EP IN */
		USBD_LL_OpenEP(	pdev,
						CDC_IN_EP,
						USBD_EP_TYPE_BULK,
						CDC_DATA_FS_IN_PACKET_SIZE);

		/* Open EP OUT */
		USBD_LL_OpenEP(	pdev,
						CDC_OUT_EP,
						USBD_EP_TYPE_BULK,
						CDC_DATA_FS_OUT_PACKET_SIZE);
	}
	/* Open Command IN EP */
	USBD_LL_OpenEP(	pdev,
					CDC_CMD_EP,
					USBD_EP_TYPE_INTR,
					CDC_CMD_PACKET_SIZE);

	pdev->pClassData = USBD_malloc(sizeof (USBD_CDC_HandleTypeDef));

	if (pdev->pClassData == NULL)
	{
		ret = 1; 
	}
	else
	{
		hcdc = pdev->pClassData;

		/* Init  physical Interface components */
		((USBD_CDC_ItfTypeDef *)pdev->pUserData)->Init();

		/* Init Xfer states */
		hcdc->TxState =0;
		hcdc->RxState =0;

		if (pdev->dev_speed == USBD_SPEED_HIGH  ) 
		{      
			/* Prepare Out endpoint to receive next packet */
			USBD_LL_PrepareReceive(	pdev,
									CDC_OUT_EP,
									hcdc->RxBuffer,
									CDC_DATA_HS_OUT_PACKET_SIZE);
		}
		else
		{
			/* Prepare Out endpoint to receive next packet */
			USBD_LL_PrepareReceive(	pdev,
									CDC_OUT_EP,
									hcdc->RxBuffer,
									CDC_DATA_FS_OUT_PACKET_SIZE);
		}
	}
	return ret;
}

/**
  * @brief  USBD_CDC_Init
  *         DeInitialize the CDC layer
  * @param  pdev: device instance
  * @param  cfgidx: Configuration index
  * @retval status
  */
static uint8_t  USBD_CDC_DeInit (USBD_HandleTypeDef *pdev, 
                                 uint8_t cfgidx)
{
	uint8_t ret = 0;

	/* Open EP IN */
	USBD_LL_CloseEP(pdev, CDC_IN_EP);

	/* Open EP OUT */
	USBD_LL_CloseEP(pdev, CDC_OUT_EP);

	/* Open Command IN EP */
	USBD_LL_CloseEP(pdev, CDC_CMD_EP);

	/* DeInit  physical Interface components */
	if (pdev->pClassData != NULL)
	{
		((USBD_CDC_ItfTypeDef *)pdev->pUserData)->DeInit();
		USBD_free(pdev->pClassData);
		pdev->pClassData = NULL;
	}
	return ret;
}

/**
  * @brief  USBD_CDC_Setup
  *         Handle the CDC specific requests
  * @param  pdev: instance
  * @param  req: usb requests
  * @retval status
  */
static uint8_t  USBD_CDC_Setup (USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{
	USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;

	switch (req->bmRequest & USB_REQ_TYPE_MASK)
	{
	case USB_REQ_TYPE_CLASS :
		if (req->wLength)
		{
			if (req->bmRequest & 0x80)
			{
				((USBD_CDC_ItfTypeDef *)pdev->pUserData)->Control(	req->bRequest,
																	(uint8_t *)hcdc->data,
																	req->wLength);
				USBD_CtlSendData (pdev, (uint8_t *)hcdc->data, req->wLength);
			}
			else
			{
				hcdc->CmdOpCode = req->bRequest;
				hcdc->CmdLength = req->wLength;

				USBD_CtlPrepareRx(	pdev, 
									(uint8_t *)hcdc->data,
									req->wLength);
			}
		}
		else
		{
			((USBD_CDC_ItfTypeDef *)pdev->pUserData)->Control(	req->bRequest,
																NULL,
																0);
		}
		break;
	default: 
		break;
	}
	return USBD_OK;
}

/**
  * @brief  usbd_audio_DataIn
  *         Data sent on non-control IN endpoint
  * @param  pdev: device instance
  * @param  epnum: endpoint number
  * @retval status
  */
static uint8_t  USBD_CDC_DataIn (USBD_HandleTypeDef *pdev, uint8_t epnum)
{
	USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;

	if (pdev->pClassData != NULL)
	{
		hcdc->TxState = 0;
		return USBD_OK;
	}
	else
	{
		return USBD_FAIL;
	}
}

/**
  * @brief  USBD_CDC_DataOut
  *         Data received on non-control Out endpoint
  * @param  pdev: device instance
  * @param  epnum: endpoint number
  * @retval status
  */
static uint8_t  USBD_CDC_DataOut (USBD_HandleTypeDef *pdev, uint8_t epnum)
{      
	USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;

	/* Get the received data length */
	hcdc->RxLength = USBD_LL_GetRxDataSize (pdev, epnum);

	/* USB data will be immediately processed, this allow next USB traffic being 
	NAKed till the end of the application Xfer */
	if (pdev->pClassData != NULL)
	{
		((USBD_CDC_ItfTypeDef *)pdev->pUserData)->Receive(hcdc->RxBuffer, &hcdc->RxLength);
		return USBD_OK;
	}
	else
	{
		return USBD_FAIL;
	}
}



/**
  * @brief  USBD_CDC_DataOut
  *         Data received on non-control Out endpoint
  * @param  pdev: device instance
  * @param  epnum: endpoint number
  * @retval status
  */
static uint8_t  USBD_CDC_EP0_RxReady (USBD_HandleTypeDef *pdev)
{ 
	USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;

	if ((pdev->pUserData != NULL) && (hcdc->CmdOpCode != 0xFF))
	{
		((USBD_CDC_ItfTypeDef *)pdev->pUserData)->Control(	hcdc->CmdOpCode,
															(uint8_t *)hcdc->data,
															hcdc->CmdLength);
		hcdc->CmdOpCode = 0xFF;
	}
	return USBD_OK;
}

/**
  * @brief  USBD_CDC_GetFSCfgDesc 
  *         Return configuration descriptor
  * @param  speed : current device speed
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t  *USBD_CDC_GetFSCfgDesc (uint16_t *length)
{
	*length = sizeof (USBD_CDC_CfgFSDesc);
	return USBD_CDC_CfgFSDesc;
}

/**
  * @brief  USBD_CDC_GetHSCfgDesc 
  *         Return configuration descriptor
  * @param  speed : current device speed
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t  *USBD_CDC_GetHSCfgDesc (uint16_t *length)
{
	*length = sizeof (USBD_CDC_CfgHSDesc);
	return USBD_CDC_CfgHSDesc;
}

/**
  * @brief  USBD_CDC_GetCfgDesc 
  *         Return configuration descriptor
  * @param  speed : current device speed
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t  *USBD_CDC_GetOtherSpeedCfgDesc (uint16_t *length)
{
	*length = sizeof (USBD_CDC_OtherSpeedCfgDesc);
	return USBD_CDC_OtherSpeedCfgDesc;
}

/**
* @brief  DeviceQualifierDescriptor 
*         return Device Qualifier descriptor
* @param  length : pointer data length
* @retval pointer to descriptor buffer
*/
uint8_t  *USBD_CDC_GetDeviceQualifierDescriptor (uint16_t *length)
{
	*length = sizeof (USBD_CDC_DeviceQualifierDesc);
	return USBD_CDC_DeviceQualifierDesc;
}

/**
* @brief  USBD_CDC_RegisterInterface
  * @param  pdev: device instance
  * @param  fops: CD  Interface callback
  * @retval status
  */
uint8_t  USBD_CDC_RegisterInterface  (USBD_HandleTypeDef   *pdev, 
                                      USBD_CDC_ItfTypeDef *fops)
{
	uint8_t  ret = USBD_FAIL;

	if (fops != NULL)
	{
		pdev->pUserData= fops;
		ret = USBD_OK;    
	}
	return ret;
}

/**
  * @brief  USBD_CDC_SetTxBuffer
  * @param  pdev: device instance
  * @param  pbuff: Tx Buffer
  * @retval status
  */
uint8_t  USBD_CDC_SetTxBuffer  (USBD_HandleTypeDef   *pdev,
                                uint8_t  *pbuff,
                                uint16_t length)
{
	USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;

	hcdc->TxBuffer = pbuff;
	hcdc->TxLength = length;  
	return USBD_OK;  
}


/**
  * @brief  USBD_CDC_SetRxBuffer
  * @param  pdev: device instance
  * @param  pbuff: Rx Buffer
  * @retval status
  */
uint8_t  USBD_CDC_SetRxBuffer  (USBD_HandleTypeDef   *pdev,
                                   uint8_t  *pbuff)
{
  USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;
  
  hcdc->RxBuffer = pbuff;
  
  return USBD_OK;
}

/**
  * @brief  USBD_CDC_DataOut
  *         Data received on non-control Out endpoint
  * @param  pdev: device instance
  * @param  epnum: endpoint number
  * @retval status
  */
uint8_t  USBD_CDC_TransmitPacket(USBD_HandleTypeDef *pdev)
{
	USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;

	if (pdev->pClassData != NULL)
	{
		if (hcdc->TxState == 0)
		{
			/* Transmit next packet */
			USBD_LL_Transmit(	pdev,
								CDC_IN_EP,
								hcdc->TxBuffer,
								hcdc->TxLength);

			/* Tx Transfer in progress */
			hcdc->TxState = 1;
			return USBD_OK;
		}
		else
		{
			return USBD_BUSY;
		}
	}
	else
	{
		return USBD_FAIL;
	}
}


/**
  * @brief  USBD_CDC_ReceivePacket
  *         prepare OUT Endpoint for reception
  * @param  pdev: device instance
  * @retval status
  */
uint8_t  USBD_CDC_ReceivePacket(USBD_HandleTypeDef *pdev)
{      
	USBD_CDC_HandleTypeDef   *hcdc = pdev->pClassData;

	/* Suspend or Resume USB Out process */
	if (pdev->pClassData != NULL)
	{
		if (pdev->dev_speed == USBD_SPEED_HIGH  ) 
		{      
			/* Prepare Out endpoint to receive next packet */
			USBD_LL_PrepareReceive(	pdev,
									CDC_OUT_EP,
									hcdc->RxBuffer,
									CDC_DATA_HS_OUT_PACKET_SIZE);
		}
		else
		{
			/* Prepare Out endpoint to receive next packet */
			USBD_LL_PrepareReceive(	pdev,
									CDC_OUT_EP,
									hcdc->RxBuffer,
									CDC_DATA_FS_OUT_PACKET_SIZE);
		}
		return USBD_OK;
	}
	else
	{
		return USBD_FAIL;
	}
}
/**
  * @}
  */ 

/**
  * @}
  */ 

/**
  * @}
  */ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
